Transformer



Jan. 27. 1925. 1,524,591

A. B. STARR TRANS FORMER Filed Feb. '7. 1924 29 I INVENTOR 30 ALDEN STARR 1 22 .4 3 BY 6 ATTORN EYS Patented Jan. 27, 1925.

UNITED STATES PATENT OFFICE.

ALDEN B. s'rAR 'o'r BROOKLYN, NEW YORK, ASSIGNOR r0 A. B. STARR EQUIPMENT CORPORATION. A CORPORATION OF NEW YORK.

TRANSFORMER.

Application field February 7, 1924. Serial No. 691,109.

To all whom it may concern:

Be it known that I, ALDEN B. STARR, a citizen of the United Statesfresiding at Brooklyn, in the county of.Kings and State of New York, have invented certain new and useful Improvements in Transformers, of which the followingis a full, clear, and exact description.

This invention relates to electrical transformers and particularly to the type known as shielded transformers. An object of. the invention is to provide an improved transformer of this type, in which the shielding is simplified in constructon and assembly, and made more durable and attractive in appearance. A further object is to .provide an improved transformer,- to the coil leads of which the circuitwires may be" connected by temporary or soldered connections in a simple manner.- Other objects and advantages will be apparent-f'from thejollowing description of anembodirnent of the-invention, and the novel, features thereof willbe particularly pointed out hereinafter in claims. r

In the accompanying drawing:

Fig. 1 is an elevation of atransformer constructed in accordance with this invention. with a portion-of the shielding broken a way to better show its construction;

Fig. 2 is an end-elevation of the same, looking from the left in Figure 1, one half of the elevation being a transverse section taken through the center of the transformer approximately along the line 2-.2 of Figure 1; Y

Fig. 3 is a perspective of the peripheral shielding of the core, detached from the transformer; and 4 Fig. 4 is a perspective of one of the terminal clips used on the terminal board of the transformer.

In the illustrated.embodiment of the invention the transformer comprises a laminated, closed loop core 1. having an intermediate crossarm 2 upon which the coils 3 are mounted between the side arms 4 of the core. A contact-terminal board 5 is confined against the' upper end cross arm 6 of the core by the coils 3,:the.terminal board having notches in each side which embrace the side arms 4 of the core so as to prevent displacement from its position between the upper end cross arm of the core and the coil. 7

form" of a U -shape so as tO-run along and embrace the side arms and uppererrd cross arr'n'of the core, and the free .endsof the lfJrame fit between the flanges 8 of the channel ase. Y

, The lower, ends of the frame 10 are providedwith tonguesll which pass through apertures or slots 12 in the bottom ofthe channel base, the tonguesthen being bent outwardly beneath the fiatends 90f the base.v The ends 9 of the base are preferably provided ,with upwardly struck recesses 13 (see Figures 1 and 3) in their lowerlfa ces, into which the tongues -11 may be bent so as not to project beneath the bottom face of the base. 1 I apertures 14 through which suitable. anchoring means-may be passed forse'curingzthc transformer to a surface or object; and the bent-over tongues 11 are provided with apertures 15 aligned-with the apertures 14 so that the securing means for anchoring the transformer vin position will,;pass both through the tongues and the base..

Side protecting members -16 -'ar'e; inserted at their lower ends 17,between the core and a flange 8 of the base, and at their:.upper ends are each provided-With atong ue 18 which is adapted to extend through an aperture 19 in the terminal contact board 5. The protecting members extend :peripheral- 1y around the exposed curved sides of the coils, and are preferably made. of sheet metal. The apertures 19 through which-the tongues 18 pass are preferably placed forwardly or outwardly away from th'e core and peripheral shielding frame ;10, southatxan electrical contact between the protectors and the core or the shielding frame 10.w ill b prevented (see Figure 2).

Suitable discs 20 are provid d..upon the intermediate cross arm 2 ofthe: core so as to abut and cover-the ends of the-coils 3, and the side protectors 16 -are prov ided along their side edges with inturned flanges :21 which extend over the periphery'of the The ends Q reQprOVided. with diSCsQO and'sIightly along -thewuteig-faces thereof,so as to confine the discs at their periphery against the coils. These'discs 20 :arerprefenabtyrmade of insulating material; such as fibre board; but various-other materials may be used successfully.

Binding posts or screws 22 pass upwardly through the terminal board 5, adjacent the corners thereof. and upon their upper ends carry lock washers 23 and lock nuts 24, as well as clamping nuts 25. Terminal clips 26' are confined to the terminal board by the screws 22,,the screws passing through apertures 27'of the clips. Each terminal clip is provided with integral arms 28 and .29

extending therefrom,.preferabl v in difierent angular directions so that conductors may be readily soldered thereto.

The arm .29 of 'each clip preferably depends from the terminal board. \vhen the clip is secured thereto, and may have a backwardly turned flange 30 forming with the arm', a groove in which the end of a coil lead or conductor. 31.mayb e soldered. The'conductor wires or 'coil leads 31' may Sass through suitable apertures in the end isc'QQf to'the'coils The arm 28 of each may be provided at its outer end with an aperture'32'or with ajflan e into which one or more; circuit'wires maybe locked and sofderd and 'thiis establish good electrical connections. between the "circuitgwires and coil l eadsfwhi'cli willnot be dependent for their. continuance upon' nuts or spring clamps-'andflthelike;

"Hbretoforefiib has been customary to solder thecoil lea ds di'rectly to the heads of the'biild lil g po s'tt'or screws 22,'but this has been 'o bjectibn able in man 'cases'owing to thE fiict-"tHat-th' 'coil' leel s frequently 'become 1 debit-lied broken therefrom by reasoh of' th turning'ofi the screw, wh ilegthe clamping 'nuts' are' treiiigtr'ghtened or lobsen edE""With this improved arrangement and -lconstruction, the continuance of :the

elebtric-circuit between the circuit wires and the coil" leads will'not be dependent. upon clampingnuts, andthere will be no danger of the coil leads becoming broken ofl when thtlamping nuts are being manipulated. Filrtl'ierinore with the clampingnuts temporary, circuit connections may. be establishedg'such as for experimental purposes or'testing and when a permanent connecis desired the circuit wires may be soldered" to the terminal clips as before describedi' The closed core-is sectional so that it may be assembled about-thecoil's aiterthe latter havebeenwoundi with the terminalboard between'the coil and {the upper-cross arm andwith the end discs 20'at the ends of the coils upon the'intermediate cross arm-19. The peripheral shieldd frame 10 is then passed "over. the side arms and-upper cross armiofi the core -and the'sideprotectors [G are applied to the coil with their tongues '18 extending through the apertures 19 of theterminalboard and witlii their .ends 17 lying fiati'againstthe lower cross arm of the core. Then the channel base 7 is applied to 'the bottom of the transformer to embrace the lower ends of the side protectors and the frame 10 with the tongues ll of thr frame 10 passing through the apertures 12 protectthe coils and do-not form a closed circuit for the eddy currents between the side protector members '16. With the particular construction described hereinbeforc and illustrated, the assembly of the complete' transformer is greatly simplified, and

the shielding of the" transformer is simple.

durable and attractive in appearance. The securing nremberswhichlare passed through the channel base for anchoring the transformer; also serve to effectively anchor the channel base and.the peripheral shielding frame 1 0 together andjto the transformer.

It willfbebbvious that various changes in the details, materials, and arrangements of parts; herein described and illustrated for the purpose ofexplaiinin the nature of the invention, may .he made' by thoseskilled in the art within the principle and scope of the invention as. expressed in the appended claims.

T claim:

1.. In a transformer having a core in the formof a cldsed loop with an lllffil'lflel'lillit cross ann upon which the .coils a re mounted between the side arms, a channel base of stamped sheetfmetal; in the channel of which the transformer rests. and :1 channel frame of bent stamped sheet metal running around and embracing the upper end and side arms'of thecore and har ingtongues passingjhrough the channel base and bent over thereon to form an interlock between them.

2. In a transformer having a core in the form of a'closedloop with an intermediate cross arm upon which the coils are mounted behveen the side arms. a channel base of stamped sheet metal. in the channel of which the transformer rests. and a channel frame of bent stamped sheet metal running around and embracing the upper Clld'lifld iio lim

side arms of the core and having tongues passing through the channel base and bent over thereon to form an interlock between them, said tongues and base having aligned apertures through which anchoring members pass.

3. In a transformer having a core in the form of a closed loop with an intermediate cross arm upon which the coils are mounted and which they surround, a channel frame embracin the outer periphery and sides of the exposed part of the core, a contactterminal board at one end of the transformer, and side members each interlocked at one end with the channel frame and at the other end to said terminal board extending around the exposed sides of the coils to protect the same.

I. In a transformer having a core in the form of a closed loop with an intermediate cross arm upon which the coils are mounted and which they surround, a channel frame embracing the outer periphery and sides of the exposed part of the core, a contact terminal board at one end of the transformer, side members each interlocked at one end with the channel frame and at the other end to said terminal board extending around the exposed sides of the coils to protcctt'he same, said side members having inturned flanges along their side edges extending over the ends of the coils, and protecting discs confined against the ends of the coils by said flanges.

5. In a transformer having a core in the form of a closed loop with an intermediate cross arm upon which the coils are mounted and which they surround, a channel frame embracing the outer periphery and sides of the exposed part of the core, a terminal hoard of insulating material mounted at one end of the transformer, and side members each interlocked at one end with the channel frame and at its other end having a portion passing through an aperture in the board out of contact with the core or channel frame, extending around the exposed sides of the coils to protect the same.

6. In a transformer having a core in the form of a closed loop with an intermediate cross arm upon which the coils are mounted and which they surround, a channel frame embracing the outer neriphery and sides of the exposed part of the core, a terminal board of insulating material mounted at one end of the transformer, side members each interlocked at one end with the channel frame and at its other end having a portion passing through an aperture in the board out of contact with the core or channel frame, extending around the exposed sides of the coils to protect the same, and protecting discs of insulating material confined against the ends of the coils b" said side members.

7. In a transformer having a core in the form of a closed loop with an intermediate cross arm upon which the coils are mounted and which they surround, a channel frame embracing the outer periphery and sides of the exposed part of the core, a terminal board of insulating material mounted at one end of the transformer, side members each interlocked at one end with the channel frame and at its other end having a portion passing through an aperture in the board out of contact with the core or channel frame, extending around the exposed sides of the coils to protect the same, said side members having inturned flanges along their side edges extending over the ends of the coils, and protecting discs of insulating material confined against the ends of the coils by the said side members.

8. In a transformer having a core in the form of a closed loop with an intermediate cross arm upon which the coils are mounted between the side arms, a channel base of stamped sheet metal in the channel of which the transformer rests, and a channel frame of bent stamped sheet metal running around and embracing the upper end and side arms of the core, said base having recesses struck up therein from the under face at each end, said channel frame having tongues upon its ends abutting the base, passing through the base and bent over into the recesses to form an interlock between the frame and base, the bent over tongues and the base having aligned apertures through which may be passed suitable elements for securing the transformer to a support.

In witness whereof, I hereunto subscribe my signature.

ALDEN B. STARR. 

